<?php
/**
 * Created by PhpStorm.
 * User: aron
 * Date: 2019/5/9
 * Time: 10:32 AM
 */

include_once "../../Util/DebugUtil/DebugUtil.php";
include_once "../../Util/define/MathDefine.php";

$radius = "2";
//$radius = floatval($radius);

echo "PI = " . PI;

$area = PI * 2 * $radius;
echo "area = {$area}";